[Bug 2004634] [NEW] Disable Ubuntu Pro registration when not online

[Sebastien Bacher]

Public bug reported:

* Impact

The current UI allows the user to try to register to Ubuntu Pro even
when the system isn't online, which eventually leads to an error since
the client fails to contact the server. The updated design disable the
registration UI in those cases and inform the user they need to get
online to be able to register which is a better experience.

* Test Case

- ensure that the machine isn't attached to ubuntu pro (otherwise the screen would not be displayed) and is online
$ pro status
and `$ pro detach` if needed

- disconnect the system, using for example the top panel indicator

- start software-properties-gtk and select the Ubuntu Pro tab

- click 'Enable Ubuntu Pro'

- The dialog controls should be disabled and a string 'Unable to connect
to Ubuntu Pro servers. Check your internet connection.' displayed at the
bottom

- reconnect the system

- the dialog control should become active and the label be removed

- register to Ubuntu Pro, that should be working


* Regression potential

If the connectivity check was wrong or not reliable it could be that the
dialog controls would be disabled even if the system is online, or that
it would fail to detect that the system isn't connected and let the user
try to register anyway.

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2004634

Title:
  Disable Ubuntu Pro registration when not online

Status in software-properties package in Ubuntu:
  New

Bug description:
  * Impact

  The current UI allows the user to try to register to Ubuntu Pro even
  when the system isn't online, which eventually leads to an error since
  the client fails to contact the server. The updated design disable the
  registration UI in those cases and inform the user they need to get
  online to be able to register which is a better experience.

  * Test Case

  - ensure that the machine isn't attached to ubuntu pro (otherwise the screen would not be displayed) and is online
  $ pro status
  and `$ pro detach` if needed

  - disconnect the system, using for example the top panel indicator

  - start software-properties-gtk and select the Ubuntu Pro tab

  - click 'Enable Ubuntu Pro'

  - The dialog controls should be disabled and a string 'Unable to
  connect to Ubuntu Pro servers. Check your internet connection.'
  displayed at the bottom

  - reconnect the system

  - the dialog control should become active and the label be removed

  - register to Ubuntu Pro, that should be working

  
  * Regression potential

  If the connectivity check was wrong or not reliable it could be that
  the dialog controls would be disabled even if the system is online, or
  that it would fail to detect that the system isn't connected and let
  the user try to register anyway.

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